Navigation ECU Communication Stop Mode: Procedure

1. Turn the power switch off.
2. Disconnect the navigation ECU sub-assembly connector.
   Fig 1: Identifying CAN BUS Wire For Disconnection (Navigation ECU Sub-Assembly Branch Wire) Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Navigation ECU Sub-assembly)

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   L130-9 (CANH) - L130-10 (CANL)	Power switch off	54 to 69 Ω

NG → REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY BRANCH WIRE) 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying Navigation ECU Sub-Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Navigation ECU Sub-assembly)

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   L127-4 (+B1) - Body ground	Always	11 to 14 V
   L127-3 (ACC1) - Body ground	Power switch on (ACC)	11 to 14 V
   L130-1 (IG) - Body ground	Power switch on (IG)	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL) 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 3: Identifying Navigation ECU Sub-Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Navigation ECU Sub-assembly)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L127-7 (GND1) - Body ground	Always	Below 1 Ω

   Result

   Result	Proceed to
   OK (for Navigation receiver type)	A
   OK (for Radio and display type)	B
   NG	C

B → See step   5 

C → REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND TERMINAL) 

A → See step   4